Analyte QC Level Spiked conc.(pg/ml)* Mean (± SD) calculated conc. (pg/ml) %RSD %RE
Levonorgestrel LLOQQC 99.611 99.263 (± 5.906) 4.30 -0.35
  LQC 290.749 284.350 (± 3.890) 3.48 -2.20
  MQC 14537.450 13351.197 (± 185.788) 2.43 -8.16
  HQC 27956.635 25973.737 (± 481.165) 3.00 -7.09
*About 400 pg/ml concentration of ethinyl estradiol concentration spiked in the QC samples
Table 2c: Precision and accuracy (n=6) of levonorgestrel (in the presence of ethinyl estradiol) in human plasma.